-The tribals left are her tattoos on her back. The wings means: rise up, and the flower means: love to life-The red eye is a kind of curse that makes her stronger but she dislikes the aspect so she has that fringe-Her nails are sharped and indestructible, that's one the habilities of her Zanpakuto

--Daughter of the Goddess of Flash: Yoruichi Shihouin, and the King of Darkness: Zaoru Kousenmi. She's the second daughter of Yoruichi, the youngest of two childs born in the noblest and most powerful clans in the Soul Society: Shihouin and Kousenmi.

When she was just a little girl, Zaoru coddled her too much, so Miku calls him "daddy" and that's why was weak and pitty. Yoruichi scaped from Soul Society with Ryunosuke (Miku's brother) and Zaoru was sentenced to seek and bring them back. Miku was left alone and Kaoru (her uncle) adopted and trained her to become an assassin.

100 years later, Zaoru returned to Soul Society, but Miku didn't recognize him. Kaoru talked to her and remembered the true story. She finally accepted Zaoru as her father.

Yoruichi arrived with Ryu and Ichigo's group to save Rukia, Zaoru noticed that and decided to help them leaving Miku alone again. She swore finish her mother and brother, but she failed with her lose against Ryu meanwhile Soi Fon was beaten by Yoruichi and Kaoru defeated by Zaoru. Miku felt angry and disillusioned.

After the end of Soul Society arc, Yoruichi and Ryu apologized to Miku, and she broke in tears between ther arms.

In fake Karakura arc, Miku fought wearing the same armor of Yoruichi, but they lose against Aizen. Miku has an another oportunity to stand him with Ryunosuke over the true Karakura town and loses again with her spine broken.

After a year of recovery, she's back in The 1000 Blood War arc, with this new look, fighting against As Nodt with Byakuya her platonic love and Renji.